He swapped them from a cheap drone he had. He says the name of the drone in the video. IMO, I'm waiting for someone here to find a way to customize the Tello with brushless motors. A Tello Pilot came so close to achieving this feat. Perhaps, we can all find an engineer who can volunteer to help and then motivate that OP who almost figured out how to mod the Tello with brushless motors.
Tello motors and props were designed on purpose to match each other.
You should only change props if the motor temperature and RPMs during hover are similar. Otherwise you'd risk premature death of the motors.